For true "extra quality," add ?quality=high or ?lods=4 to the end of the game URL. For example: https://www.unblocked66.com/geofs/index.html?quality=ultra&shadows=on
Accessibility, Architecture, and Ethics: An Analysis of "GeoFS Unblocked 66 Extra Quality" and Browser-Based Flight Simulation in Restricted Networks geofs unblocked 66 extra quality